CVE-2026-15305

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 83% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured. The restriction was not enforced server-side because the MimeTypeValidator was registered during form building before concrete form definition properties were applied, resulting in the validator never being added to the processing pipeline. This issue affects TYPO3 CMS versions 14.2.0-14.3.4.

CVSS v3
6.3
EG Score
6.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

July 14, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Jul 14, 2026
No patch confirmed yet.
generic

TYPO3-CORE-SA-2026-020: Unrestricted File Upload in Form Framework - TYPO3 News

https://typo3.org/security/advisory/typo3-core-sa-2026-020

Vendor Advisories for CVE-2026-15305(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
typo3/cms-formv14.2.0 ... v14.3.4 (6 versions)14.3.5—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 135 total refreshes for this CVE.

  1. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-18 04:55 UTCEG score recompute
  3. 2026-09-16 14:07 UTCEPSS rescore
  4. 2026-09-16 05:14 UTCEPSS rescore
  5. 2026-09-14 06:58 UTCEG score recompute
  6. 2026-09-13 16:46 UTCEPSS rescore
  7. 2026-09-13 07:55 UTCEG score recompute
  8. 2026-09-12 15:00 UTCEPSS rescore
  9. 2026-09-12 01:47 UTCEG score recompute
  10. 2026-09-11 14:52 UTCEPSS rescore
  11. 2026-09-11 09:36 UTCEPSS rescore
  12. 2026-09-10 09:34 UTCEPSS rescore
  13. 2026-09-08 22:00 UTCEPSS rescore
  14. 2026-09-08 01:48 UTCEG score recompute
  15. 2026-09-07 16:01 UTCEPSS rescore
  16. 2026-09-06 13:47 UTCEPSS rescore
  17. 2026-09-05 21:18 UTCEG score recompute
  18. 2026-09-04 05:06 UTCEPSS rescore
  19. 2026-09-03 04:21 UTCEG score recompute
  20. 2026-09-02 14:11 UTCEPSS rescore
  21. 2026-09-01 13:53 UTCEPSS rescore
  22. 2026-09-01 04:39 UTCEPSS rescore
  23. 2026-08-31 05:45 UTCEG score recompute
  24. 2026-08-31 05:45 UTCGHSA enrichment
  25. 2026-08-30 19:17 UTCEPSS rescore
Show 75 more
  1. 2026-08-30 05:25 UTCEG score recompute
  2. 2026-08-30 05:25 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 23:00 UTCEG score recompute
  6. 2026-08-27 23:00 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-27 00:00 UTCEG score recompute
  9. 2026-08-27 00:00 UTCGHSA enrichment
  10. 2026-08-26 14:46 UTCEPSS rescore
  11. 2026-08-25 19:14 UTCEG score recompute
  12. 2026-08-25 19:14 UTCGHSA enrichment
  13. 2026-08-25 13:48 UTCEPSS rescore
  14. 2026-08-24 19:51 UTCEG score recompute
  15. 2026-08-24 19:51 UTCGHSA enrichment
  16. 2026-08-23 20:33 UTCGHSA enrichment
  17. 2026-08-22 21:34 UTCEG score recompute
  18. 2026-08-22 21:34 UTCGHSA enrichment
  19. 2026-08-21 23:49 UTCEPSS rescore
  20. 2026-08-21 22:35 UTCGHSA enrichment
  21. 2026-08-20 23:35 UTCEG score recompute
  22. 2026-08-20 23:35 UTCGHSA enrichment
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-20 00:36 UTCEG score recompute
  25. 2026-08-20 00:36 UTCGHSA enrichment
  26. 2026-08-19 17:03 UTCEPSS rescore
  27. 2026-08-18 20:06 UTCEG score recompute
  28. 2026-08-18 20:06 UTCGHSA enrichment
  29. 2026-08-17 13:47 UTCEPSS rescore
  30. 2026-08-17 13:19 UTCEG score recompute
  31. 2026-08-17 13:19 UTCGHSA enrichment
  32. 2026-08-16 14:56 UTCEPSS rescore
  33. 2026-08-16 14:20 UTCEG score recompute
  34. 2026-08-16 14:20 UTCGHSA enrichment
  35. 2026-08-16 02:14 UTCEPSS rescore
  36. 2026-08-15 15:21 UTCEG score recompute
  37. 2026-08-15 15:21 UTCGHSA enrichment
  38. 2026-08-15 01:30 UTCEPSS rescore
  39. 2026-08-14 16:22 UTCEG score recompute
  40. 2026-08-14 16:22 UTCGHSA enrichment
  41. 2026-08-13 22:00 UTCEPSS rescore
  42. 2026-08-13 17:22 UTCGHSA enrichment
  43. 2026-08-12 18:21 UTCEG score recompute
  44. 2026-08-12 18:21 UTCGHSA enrichment
  45. 2026-08-12 13:50 UTCEPSS rescore
  46. 2026-08-11 19:16 UTCEG score recompute
  47. 2026-08-11 19:16 UTCGHSA enrichment
  48. 2026-08-11 13:42 UTCEPSS rescore
  49. 2026-08-11 00:00 UTCEPSS rescore
  50. 2026-08-10 20:17 UTCGHSA enrichment
  51. 2026-08-09 21:18 UTCEG score recompute
  52. 2026-08-09 21:18 UTCGHSA enrichment
  53. 2026-08-09 13:46 UTCEPSS rescore
  54. 2026-08-08 22:19 UTCEG score recompute
  55. 2026-08-08 22:19 UTCGHSA enrichment
  56. 2026-08-08 16:37 UTCEPSS rescore
  57. 2026-08-07 23:20 UTCGHSA enrichment
  58. 2026-08-07 00:20 UTCEG score recompute
  59. 2026-08-07 00:20 UTCGHSA enrichment
  60. 2026-08-06 13:46 UTCEPSS rescore
  61. 2026-08-06 01:20 UTCEG score recompute
  62. 2026-08-06 01:20 UTCGHSA enrichment
  63. 2026-08-05 19:17 UTCEPSS rescore
  64. 2026-08-05 02:21 UTCEG score recompute
  65. 2026-08-05 02:21 UTCGHSA enrichment
  66. 2026-08-04 15:10 UTCEPSS rescore
  67. 2026-08-04 03:14 UTCEG score recompute
  68. 2026-08-04 03:14 UTCGHSA enrichment
  69. 2026-08-03 10:35 UTCEPSS rescore
  70. 2026-08-03 04:15 UTCGHSA enrichment
  71. 2026-08-02 05:15 UTCEG score recompute
  72. 2026-08-02 05:15 UTCGHSA enrichment
  73. 2026-08-02 02:26 UTCEPSS rescore
  74. 2026-08-01 06:16 UTCEG score recompute
  75. 2026-08-01 06:15 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-15305?
CVE-2026-15305 is a medium vulnerability published on July 14, 2026. Users were able to upload files with arbitrary MIME types to forms using FileUpload or ImageUpload elements with allowedMimeTypes configured. The restriction was not enforced server-side because the MimeTypeValidator was registered during form building before concrete form definition properties…
When was CVE-2026-15305 disclosed?
CVE-2026-15305 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15305 actively exploited?
CVE-2026-15305 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 82.7% of all scored CVEs.
What is the CVSS score of CVE-2026-15305?
CVE-2026-15305 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-15305?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15305, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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